In order to reduce the auxiliary time and increase the efficiency, it is required that the CNC machine tool CNC mechanical and electrical engineering spindle's start and stop time is as short as possible, so the demand for high start and stop plus (minus) speed. At present, the acceleration of the start and stop of the CNC mechanical and electrical engineering spindle of overseas machine tools can reach more than lg, and the full-speed start and stop time is less than l s.
The CNC mechanical and electrical engineering spindles produced by these companies have the following characteristics compared with those produced by Zhonghua: high power and high speed; high-speed and high-rigidity bearings are used, high-speed and high-rigidity bearings are selected on overseas high-speed and compact spindles, with ceramic bearings and Hydrodynamic and hydrostatic bearings, unique air curtain bearings and magnetic suspension bearings; high level of processing and careful equipment; high level of supporting control system, including automatic rotor average system, bearing oil and gas smooth and careful control system, stator cooling The temperature control system and the spindle deformation temperature compensate for the careful control system. On this basis, these foreign manufacturers, such as the United States, Japan, Germany, Italy and Switzerland, have developed a variety of commercial high-speed machine tools.
Development trend of CNC mechanical and electrical engineering spindle technology
A、Continue to develop towards high speed and high stiffness goalsDue to the demand for high-speed CNC machining and cutting, and the development of related technologies such as spindle bearing and its smooth technology, careful processing technology, careful moving average technology, high-speed tool and its interface technology, CNC numerical control electromechanical engineering spindle for CNC machine tools It has become a broad trend of development at present, such as CNC mechanical and electrical engineering spindle for drilling and milling. The speed of HF42 of Swiss IBAG reaches 140 000 r/min, and the CNC drilling and mechanical engineering spindle D1733 of British WestWind Company is arriving. 250 000 r / min; machining center CNC mechanical and electrical engineering spindle, Switzerland FISCHER reached 42 000 r / min at very high speed, Italy CAMFIOR reached 75 000 r / min. In terms of the system stiffness of the CNC mechanical and electrical engineering spindle, due to the development of the bearing and its smooth technology, the CNC mechanical and electrical engineering spindle has a more and more rigid system, which meets the requirements of high-speed, high-efficiency and precision machining development of CNC machine tools.
B、Development of high-speed, high-power, low-speed and high-torque targets According to the requirements of the essential application, the demand of numerous CNC machine tools can meet the requirements of heavy CNC machining cutting and high-speed CNC machining during low-speed roughing. Therefore, the machine tool CNC numerical control electromechanical engineering spindle should have low speed, high torque, high speed and high power performance. It is not difficult to use the CNC numerical control electromechanical engineering spindle for the machining center made by the manufacturers such as CAMFIOR, Swiss Step-Tec and Germany GMN. It is not difficult to transport the torque to 200 N·m or above in the low speed section. CNC milling machine and lathe CNC of Germany CYTEC The large torque of the CNC electromechanical engineering spindle reaches 630 N·m; in the high-speed section, the power is usually 10 to 50 kW; the CYTECCNC numerical control electromechanical engineering spindle has a large transmission power of 50 kW; Switzerland Step-TecCNC The large-scale power of the CNC electromechanical engineering spindle reaches 65 kW (S1) for aircraft manufacturing and mold processing; more reports of CNC mechanical and electrical engineering spindle power reaching 80 kW.
C、Further development towards high precision, high reliability and extended working life The user puts higher and higher requirements on the precision and application reliability of the CNC machine tool. As one of the core performance components of the CNC machine tool, the CNC numerical control electromechanical engineering spindle requires its own precision and reliability to be higher and higher. For example, the radial runout of the main shaft is within 0.001 mm and the axial positioning accuracy is below 0.5 μm. At the same time, due to the selection of unique and precise spindle bearings, advanced smoothing method and unique preload application method, the life of CNC numerical control electromechanical engineering spindle has been lengthened accordingly, and its application reliability is getting higher and higher. Step—Tec's CNC numerical control electromechanical engineering spindle is also equipped with an acceleration sensor to reduce the vibration acceleration level of the bearing. In order to supervise and limit the vibration on the bearing, a vibration monitoring module is installed to lengthen the working life of the CNC numerical control mechanical engineering spindle.
D、CNC CNC electromechanical engineering spindles with built-in electric effects performance and mode diversification In order to meet the needs of essential use, the performance of CNC mechanical and electrical engineering spindle motor has been improved. For example, the ratio of constant torque high speed and constant power high speed (ie constant power speed limit) delivered by Swiss FISCHER spindle motor is arrived. l: 14. In the rest, there is a permanent magnet synchronous motor CNC mechanical and electrical engineering spindle. Compared with the same power asynchronous motor CNC mechanical and electrical engineering spindle, the synchronous motorized CNC mechanical and electrical engineering spindle has a small external appearance, which is conducive to increasing the power density. Complete small size and high power.
E、Quickly start and stop the response speed acceleration In order to reduce the auxiliary time and increase the efficiency, it is required that the CNC machine tool CNC mechanical and electrical engineering spindle's start and stop time is as short as possible, so the demand for high start and stop plus (minus) speed. At present, the acceleration of the start and stop of the CNC mechanical and electrical engineering spindle of overseas machine tools can reach more than lg, and the full-speed start and stop time is less than l s.
